I am at the TA in Ontario California, there is a West and an East.
I went to the Walmart at first, no overnite trucks allowed!
The straight trucks are allowed to park in the front with all customers, motorhomes and the overnite cars. However, the bobtails are being asked to leave when they come in.
The security guards are doing their jobs to watch the parking lot. There is laundry, Country Pride, Burger King, Taco bell, pool table and a large game room. In addition, there is a guy driving around in the white van offering you rides to anywhere and if you want to stop and buy some movies.
No problems staying at the TA but the big trucks do have to pay if they do not purchase either $20 gas, or something within the store totally that amount (a day).